Henley



UNITED STATES PATENT OFFICE.

IILLIAM T. HENLEY, OF PLAISTOV, COUNTY OF ESSEX, ENGLAND, GEORGE H'ENL'EY AND SYDNEY GEDGE, EXEOUTORS OF SAID HENLIIY, DECF-ASEO TELEGRAPH-CABLE..

SPECIFICATION forming part; of Letters Patent No. 286,698, dated October 16, 1883.

Application filed September Q7, i881. (No model.) Patented in England April 30, IBSI, No.1,S73; in France May 30, 18H1, and in Belgium May 30, 188i.

To @ZZ whom, it may concern:

Be it known that I, Wrimnlni 'lli-tenis HEN- LEY, of Ilaistow, in thecountyoi'EsseX, Eng land, telegraphengineer, have invented new and useful Improvements in Electric Cables i'or Telephone and other Purposes, (for which I have obtained apatentin Great Britain, No. 1,873, bearing date the 30th day ot'April,1SSl,)' ot which the following is a specitication.

According to the invention I construct combined conductors for telephonie, telegraphic, and other purposes, as hereinafter described, by which means I obtain additional strength and security, and obviate the disturbing effects produced by induction from wire to wire.

v Imake the insulated wires with any suitable material, but prefer the vozocerited india-rubber, as described in the specification of my Vformer patent dated JApril 5, 1881, No. 239, 7 7 (i. I inclose the wires by means of rollers or dies in the insulating material in pairs orany further number, as shown by the accompanying drawings. Figure l shows a single pair, Fig. 2, three pairs united, the spaces between each pair being greater than between the wires of each pair. This is to prevent the induction when using the metallic circuit for telephone purposes, as that is found to be much better than using the earth for the return-circuit. The metallic circuit is found to reduce the effects of induction considerably, but by my present improvements it will be diminished very much more, and the distances capable of being worked very much increased, also the tensile strength ofthe ropes, bands, and cables much increased. To obtain the latter eii'ect I make one wire ol' each pair ot' steel, by preference galvanized or zinc-coated. This should be as much largerthan the copper wire in same circuit as its electrical resistance is greater, so that the electrical conductivity of the pair of wires, steel and copper, should be as nearly as possible equal.

Fig. l shows a pair of wires thus constructed, and Fig. 3 a band ot' wires similarly made, with wider intervals between each pair; and Fig. l shows several such bands superposed, with tarred felt or other suitable material between eacli layer to keep the wires a suitable distance apart to counteract the inductive effeets. These may be deposited in an iron or wood trough, or may be made up into a com bined belt to be suspended from point to point or laid along the roofs of houses. 'Vhen laid under ground in pipes or troughs, the wires may be all copper, as shown in Figs. 5 and 6, as so much tensile strength is not required. Figu 7 shows some ofthe twin eireuitsiorthetelephouc -laid up spirally round a central steel strand gle instead of vbeing made in pairs; but for telephonie purposes each two wires should be separated by a space from the nexttwo wires, as here shown. Fig. 9 shows the wires of copper and steel insulated round a central core ot' hemp or other suitable material. In this ease the insulated steel wires,while forming part oi' the circuit, give the .necessary tensile strength without the central steel strand. Fig. IOshows a double row according to same plan. Fig. ll shows insulated wires laid up round a central cord of suitable material, with insulated steel wires laid up spirally, also with tarred cords oi'- hemp or other suitable material to keep the steel wires from injuring the cores. These cores and steel wires may be laid up in a double row, as shown. to give great strength to the rope for the purposes ci' suspension or otherwise, and maybe used for the return-circuit, especially for tele` graph purposes.

I claim as my inventionl. An electric cable made as a belt, with two parallel metallic conductors inclosed in and insulated by a web of ozocerited indiarubber, having a groove on each side between the conductors, substantially as and for the purposes set forth.

2. An electric cable made as a belt, with pairs of parallel metallic conductors inclosed in and insulated by a web of ozocerited indiarubber having grooves on each side between The steel wires will be l'ound IOO the conductors, the distance between two pairs i of such conductors being greater than the (listance between the conductors of each pair,sub stantially as and for the purposes specified.

3. An electric cable made as a belt, with two parallel conductors, one of copper and the other of Vsteel having sectional areas in the inverse proportion of their electrical concluctivity,the said conductors being inclosed in and insulated by a web of ozocerited india-rubber, having a groove on each side between the conductors, substanti ally as and for the purposes set forth.

4. An electric cable made as -a belt, with pairs of parallel conductors, one conductorin each pair being oi' copper and Jthe other of steel, with sectional areas in the inverse proportion of their electrical conductivity, and. the said conductors being inclosed in and i11- sulated by a web of ozocerited india-rubber,

having grooves on each side between the con- 2o ductors, the distance between two pairs of such conductors being greater than the dis- 

